littoral vs seacoast

littoral

noun
  • A shore. 

  • The zone of a coast between high tide and low tide levels. 

adj
  • Of or relating to the shore, especially the seashore. 

seacoast

noun
  • the coastal land bordering a sea or ocean 

How often have the words littoral and seacoast occurred in a corpus of books? (source: Google Ngram Viewer )